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Physics B

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A car slows down from 23 m/s to rest in a distance of 85m. What is its constant acceleration?

I got -6.224, but a friend was telling me it's -3.11 and that I had to divide by 2. Why is that?

  • Physics B -

    The average velocity during deceleration is 11.5 m/s. The time required to decelerate is 85/11.5 = 7.39 s
    The acceleration rate is -23 m/s/7.39s = -3.11 m/s^2
    I added the minus sign because it is decelerating

  • Physics B -

    How did you get the average velocity?

  • Physics1 -

    i think -3.11

  • Physics B -

    A car slows down uniformly from a speed of 15.0 m/s to rest in 6.00 s .

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